This document summarizes O2's experience with eco-labeling and certification for mobile phones. It discusses: 1) Why O2 developed an Eco Rating system for mobile phones, which rates devices on a 0-5 scale based on corporate and device sustainability. Consumer research found sustainability would influence 44% of buyers. 2) The positive reaction to the Eco Rating from consumers, suppliers, stakeholders, and media. It provides a simple, clear picture of environmental impact. 3) O2's plans to expand the Eco Rating system within its parent company Telefonica and work with other telecom companies to develop a global sustainability standard for devices. O2 also released sustainability goals for 2015 through its Think Big